PPM measures parts per million. ppm is known as dimensionless quantities; that is, they are pure numbers with no associated units of measurement. A mass concentration of 2mg/kg - 2 parts per million - 2ppm - 2 x 10[SUP]-6[/SUP].
There are many different scales used for different industries around the world and for many different reasons! Did you even know there are more than two scales? The most widely used scales in Hydroponics are the 500 scale, 650 scale and the 700 scale.
What's the difference? The ppm 700 scale is based on measuring the KCl or potassium chloride content of a solution. The ppm 500 is based on measuring the NaCl or sodium chloride content of a solution and is also referred to as TDS - total dissolved solids. Individual nutrient ions have different electrical effects! The true ppm of a solution can only be determined by a chemical analysis. ppm cannot be accurately measured by a CF or EC meter.
2.4EC x 500 = 1200ppm (500 scale) or 1200ppm / 500 = 2.4EC
2.4EC x 700 = 1680ppm (700 scale) or 1680ppm / 700 = 2.4EC
Manufacturer Scale
Advanced Nutrients 700 scale
Botanicare 700 scale
CES/Cutting Edge Solutions 500 scale
Dutch Master 500 scale
FoxFarm 700 scale using dechlorinated tap water
General Hydroponics 500 scale using reverse osmosis water
General Organics 500 scale using reverse osmosis water
House & Garden 700 scale
Humboldt Nutrients 500 scale
Rock Nutrients 700 scale
Technaflora 500 scale
So, Besides two manufactures, none use RO water. So this creates an issue. And its almost a 50/50 breakup of conversions. Maybe, we need to go back to the drawing board?
Am I missing something? This to me, means a lot.
Cowboy
There are many different scales used for different industries around the world and for many different reasons! Did you even know there are more than two scales? The most widely used scales in Hydroponics are the 500 scale, 650 scale and the 700 scale.
What's the difference? The ppm 700 scale is based on measuring the KCl or potassium chloride content of a solution. The ppm 500 is based on measuring the NaCl or sodium chloride content of a solution and is also referred to as TDS - total dissolved solids. Individual nutrient ions have different electrical effects! The true ppm of a solution can only be determined by a chemical analysis. ppm cannot be accurately measured by a CF or EC meter.
2.4EC x 500 = 1200ppm (500 scale) or 1200ppm / 500 = 2.4EC
2.4EC x 700 = 1680ppm (700 scale) or 1680ppm / 700 = 2.4EC
Manufacturer Scale
Advanced Nutrients 700 scale
Botanicare 700 scale
CES/Cutting Edge Solutions 500 scale
Dutch Master 500 scale
FoxFarm 700 scale using dechlorinated tap water
General Hydroponics 500 scale using reverse osmosis water
General Organics 500 scale using reverse osmosis water
House & Garden 700 scale
Humboldt Nutrients 500 scale
Rock Nutrients 700 scale
Technaflora 500 scale
So, Besides two manufactures, none use RO water. So this creates an issue. And its almost a 50/50 breakup of conversions. Maybe, we need to go back to the drawing board?
Am I missing something? This to me, means a lot.
Cowboy
